Dobinsons Suspension options for 2024+ Land Cruiser 250 Series / Lexus GX550

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vraa said:
Are the test bed GX overtrail with ekdss?
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Yes.

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🛠️ Member Build - Eddie's 2024 OverTrail

Hello All, My name is Eddie from Southern California. I picked up my Overtrail from Longo Lexus on July 2024. Big thanks to Dennis lo from Fleet Department for getting me the GX with no Markup. My previous daily driver was a 2014 GX460 wrapped in a milk tea color from Milliotone film. I have...
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What about AVS? Another thread I read said some guy had a light
 
The Dobinsons billet aluminum UCA's have just come into stock.

Full details here: Dobinsons Billet Aluminum UCA's Pair | LX600 GX550 LC300 LC250 Tacoma - https://exitoffroad.com/product/dobinsons-billet-aluminum-ucas-lx600-and-lc300/

Dobinsons Billet Aluminum UCA Pair LX600 GX550 LC300 LC250 Tacoma UCA59-212K.webp
 
Just added the 2 front twin tube strut options and the rear twin tube shock options to the first post. I originally thought Dobinsons weren't going to offer the classic twin tubes for these platforms, but they decided otherwise. Front struts are due soon, rear shocks are in stock already.

Also added the new twin tube suspension kit pages. FYI, GS refers to Gas Shock, the nickname Dobinsons have used for twin tubes forever, so GS59-660 means "gas shock" for example, where as IMS... and MRA... designate those types of shocks.

​

 
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vraa said:
What about AVS? Another thread I read said some guy had a light
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Dobinsons have finally replied about it.

GX550 with the Overtrail edition or any other edition with the electrical plug on the rear shocks will eventually show an error code on the dash. The only way to get rid of the code for right now is to plug in the old shocks and it goes away temporarily. We have to wait until someone comes out with a bypass module for the rear shocks.

The error code on the dash doesn't affect anything else, but people do find it annoying.
 
Thanks for the info crikeymike. I’ve got a LC250 with 385 lbs or so constant load in the rear. There doesn’t seem to be a rear spring in that range. Would you recommend going down to the 817V or up to the 819V?
 
PhredT said:
Thanks for the info crikeymike. I’ve got a LC250 with 385 lbs or so constant load in the rear. There doesn’t seem to be a rear spring in that range. Would you recommend going down to the 817V or up to the 819V?
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I suggest going on the lower end of the range, the 817V's, because if you run the stronger ones without that extra weight it could lift more and feel more firm than necessary.
 
Other than the diff drop, what other considerations should be taken into account when deciding on the stock length travel vs extended travel shocks offered in these kits from dobinsons? Are there any downsides of the extended travel especially if ran on a 95% daily driver like mine?
 
PhredT said:
Other than the diff drop, what other considerations should be taken into account when deciding on the stock length travel vs extended travel shocks offered in these kits from dobinsons? Are there any downsides of the extended travel especially if ran on a 95% daily driver like mine?
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You have to run UCA's with them and at least 2" of lift. Dobinsons haven't set a requirement for extending the front bump stops but I'm waiting to hear back from them if that should be done. (edit: no changes needed)

Other than that, you wouldn't notice the difference running them daily. You'll just get more travel when Offroad.
 
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Thanks again crikeymike.

My 35x11.5” tires clear everything now including going lock to lock while sitting on the factory front bump. Other than making sure the tire stays out of the fender, what else would drive the need for extended front bump stops? Is somehow the motion range shifted/offset downwards on the extended travel dobinsons meaning you could reach end of upward shock travel before hitting the bump?
 
PhredT said:
Thanks again crikeymike.

My 35x11.5” tires clear everything now including going lock to lock while sitting on the factory front bump. Other than making sure the tire stays out of the fender, what else would drive the need for extended front bump stops? Is somehow the motion range shifted/offset downwards on the extended travel dobinsons meaning you could reach end of upward shock travel before hitting the bump?
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It's to prevent shock bottom-out. If the extended travel shocks have a longer compressed length than the normal ones, then they may require an extension on the front bump stops.

Edit, I keep forgetting that some of the new Toyota/Lexus have no external bump stops on the frame.

The extended travel struts don't require any bump stop changes, I just heard back from Dobinsons. See attached info on assembling those with the OEM strut caps.
 

Attachments

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crikeymike said:
It's to prevent shock bottom-out. If the extended travel shocks have a longer compressed length than the normal ones, then they may require an extension on the front bump stops.

Edit, I keep forgetting that some of the new Toyota/Lexus have no external bump stops on the frame.

The extended travel struts don't require any bump stop changes, I just heard back from Dobinsons. See attached info on assembling those with the OEM strut caps.
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1. I think the LC250 and the GX550 (this thread) both use external bumps.
2. Seeing #1, it seems a little strange in dobinsons instructions you linked (thanks btw), they refer to an OEM bump stop on the shock shaft. Is this terminology correct?
3. I saw someone post in a comment online for tacomas, that the extended travel versions of the MRR reduce up travel in favor of more droop. Does anyone know if the up travel is different between the standard and extended travel options for the LC250?

Thanks!
 
PhredT said:
1. I think the LC250 and the GX550 (this thread) both use external bumps.
2. Seeing #1, it seems a little strange in dobinsons instructions you linked (thanks btw), they refer to an OEM bump stop on the shock shaft. Is this terminology correct?
3. I saw someone post in a comment online for tacomas, that the extended travel versions of the MRR reduce up travel in favor of more droop. Does anyone know if the up travel is different between the standard and extended travel options for the LC250?

Thanks!
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#1 - I think the same thing.

Some of the models that the front struts will go on don't have an external bump stop, like the Tacoma for example. The IMS59-60660 and MRA59-A660 will come with a shaft-mounted bump stop, when they come into stock. I'm not sure why they put that note on there like that.

Keep in mind that all of these new models share interchangeable sizes of parts: Sequoia, Tundra, LC250, GX550, Tacoma, 4Runner. Even the LC300 and LX600 share the same sizes for the most parts, but there are variations. There are 3 different strut mounts as an example among those models. Not sure what bozo at Toyota thought they needed that much variation between them.

The only current option for a Tacoma that limits travel is the rear long travel shocks, which are the same as any rear long travel shocks, you gain droop but lose up travel and have to space the bump stops to stop the shocks from bottoming out too early.
Like these: Dobinsons MRA59-A941 3-Way Adjustable Rear LT Shocks - https://exitoffroad.com/product/dobinsons-mra59-a941-long-travel-rear-tacoma-shocks/
 
When Dobinsons confirmed no bump stop changes needed for extended travel shocks/struts on the LC250, was that for front AND rear? I’m considering the MRR extended and want to make sure my ducks are in a row. Thanks.
 
That's right.

But ultimately for the front, it depends on what coils you use and how much lift you have. If the coils get preloaded a bit, extended bump stops will stop the coils from hitting coil bind. it's usually not a problem on any of the Toyota gear we sell, but that's the thing to watch out for.

There's no issue on the rear with the shock length.

They'll probably do a long travel version down the road with different rear coils and all that, but for now, all the rear lift heights are fairly low since 35's can fit on these new models fairly easily, and LT isn't a big seller compared to regular travel.

Here's what that notice looks like on some vehicle applications:
1742476581054.webp
 
Hi Crikey,

A few questions.

1)On the Dobinsons site the LC250 spring is listed as this (50mm, 2.0”), whereas on ExitOffroad it’s listed as 40mm 1.6”. Are there two options for this spring? Or, it seems like the 50mm is made for the GX550.
  • C59-885V (50mm - 2") 0-110lb Load
2)If I get the 2” lift stock load front springs and think it sits too high, the IMS and MRR shocks lets me adjust the perch LOWER to lower the height right? As in, the base adjustable perch height is not at the very bottom of the threads.

3) I have OEM steel LC First Edition skids, aluminum sliders, and a roof rack. Not planning on front or rear bumpers or a winch. I should get about the advertised height, right?

4)the MRR shocks on the plushest setting can cancel out some of the harshness on-road of an E-rated tire no?
 
lcdad said:
Hi Crikey,

A few questions.

1)On the Dobinsons site the LC250 spring is listed as this (50mm, 2.0”), whereas on ExitOffroad it’s listed as 40mm 1.6”. Are there two options for this spring? Or, it seems like the 50mm is made for the GX550.
  • C59-885V (50mm - 2") 0-110lb Load
2)If I get the 2” lift stock load front springs and think it sits too high, the IMS and MRR shocks lets me adjust the perch LOWER to lower the height right? As in, the base adjustable perch height is not at the very bottom of the threads.

3) I have OEM steel LC First Edition skids, aluminum sliders, and a roof rack. Not planning on front or rear bumpers or a winch. I should get about the advertised height, right?

4)the MRR shocks on the plushest setting can cancel out some of the harshness on-road of an E-rated tire no?
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1742580713731.png

exitoffroad.com

Dobinsons C59-885V Rear Coil Springs Pair

Dobinsons C59-885V Rear Lift Coils, offered in Teal, Black and Red Colors, lift your Toyota with these high quality Australian-made Coil Springs
exitoffroad.com exitoffroad.com

The GX550 rear end is lighter because it doesn't have the battery pack, so it sits taller than the LC250. The same spring is used on 2 vehicles and produces 2 different lift heights based on the weight differences.

There's a minimum height to set IMS/MRA shocks to, otherwise you can run into the sway bar or other components. No, you can't go lower than the minimum for that reason.

Yeah, that gear you've got probably doesn't add much weight and it's not adding leverage off the front or rear either.

Not necessarily, that harshness comes from the tires being so heavy and the way they hit the ground, which then transfers through the suspension to the vehicle cabin. That's why rubber bushings in all control arms are best, to help isolate those sorts of things.
 
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